Push Update Killed My Phone?!?!

My phone battery was at 11% the other night so I turn it off and plug it in for a good overnight charge. An Android icon shows up, with the words underneath, something like "updating do not turn off device..." So didn't and when I work up the battery was dead and the phone will no longer charge it.

WTF was this? an official update or something else?
More importantly, how do I fix it?

It seems like a step is missing there. So you turned the phone off at 11%--does this mean you powered it off completely, or just put the screen to sleep? Then you plugged it in overnight to a wall outlet to charge. Now when did you see the Android screen? Was it an Android with its chest compartment opened up, and a twirling shape in it? Did you power on the phone any time before this?

It seems like a step is missing there. So you turned the phone off at 11%--does this mean you powered it off completely, or just put the screen to sleep? Then you plugged it in overnight to a wall outlet to charge. Now when did you see the Android screen? Was it an Android with its chest compartment opened up, and a twirling shape in it? Did you power on the phone any time before this?

1) ran battery down to 11%
2) turned phone off
3) plugged wall charger in phone
4) within 1 minute Android icon (no gears in chest ) and message appeared
5) went to sleep
6) woke up and phone was dead. battery won't charge in phone
7) same thing happened to my backup phone!!!!!
used a different charger too.

After it was factory reset, did any of the apps automatically reinstall? Factory resetting a phone and then setting it back up with your Google account doesn't necessarily mean it's a clean slate, since it could have automatically reinstalled your apps (if you had Automatically Restore checked in Settings>Backup & Reset).